Runningboard bolt



Ng N N G. c. DAVIS RUNNING BOARD BOLT Filed Aug. 5l, 1925 @Aitor mug 'lill fatented fitug. 7, llhff or tenerne,

GEORGE C. D'ATS,

FURA'llllUN,

` RUNNILNGBARD BULE.

,application tiled August 31, 19%.

rlfhis invention has to do with headed fasteners and particularly with bolts of the type used in the assembly of automobiles to secure the wooden running boards upon the chassis-carried brackets.

ltleretofore it has been common practice to use for this purpose bolts having the upper portions of their shanks made square to prevent their rotation. lln practice it has been found that these squared portions have been ineffectual in preventing rotation of the bolts when the nuts are screwed thereon, particularly when there are burrs upon the threads of the bolts or when the threads have become filled with paint, sawdust or the like, making it difficult to thread the nuts upon the bolts.-

My improved bolt is provided with integral prongs which bite into the wood or other ftd relatively soft material with which it is used. litotation of the bolt while the nut is being drawn up is thus effectively prevente 1n the drawings, Figure 1is a view partly in section, showing my improved fastener in position; l

Figure 2 is a section on line 2,-2 of Figure 1;

Figure 3 is a side elevation of a modified form of bolt;

Figure 4 is a section on line l--lf of Fig- Reference character 2 indicates a portion of ,an automobile running board, while reference character l indicates a portion of a bracket vwhich serves to support it from the chassis.

My improved fastener is indicated generally by reference character 6 and comprises 4the apex thereof comprising 'Serial No. 53,565.

a head 12 and shank 8 threaded to receive a nut 10. rllhe head of the bolt is provided with notches 14 formed by cutting into the head and pressing down the material at one side of the cut to form prongs 16 rllhese prongs bite into the wood and serve to prevent rotation of the bolt while the nut is being drawn up thereon.

lWhile lin the form shown in Figures 1 and 2 the upper portion of the shank of the bolt is shown squared, as at 18, in the form shown in Figures 3 and t the shanks are of circular cross sections as shown at 20, the prongs alone being relied upon to hold the bolt against rotation.

`What l claim Letters Patent is:

A lag bolt, including a solid shank, adapted to be projected through a body, a platelike integral head on said solid shank, having a flat undersurface, adapted to abut said body, said head having a sing e radial incision extending from the periphery thereof into proximity with the solid shank, and a dependent ear adapted to bite into said body as the plate-like head is forced into abutment therewith, said ear consisting (of the material of the plate-like head to one side of the radial incision which is bent downwardly on a divergent line into substantially the direction of' the longitudinal axis of the solid shank, and being of triangular shape,

the point of inperipheral edge of the platethe edge at the radial inciand desire to protect by tersection of the like head with sion.

1n testimony whereof ll atiix my signature.

- GFU. C. DrVllS. 

